CN111357221B

CN111357221B - Techniques and apparatus for hybrid automatic repeat request design of polar codes for ultra-reliable low-latency communications

Info

Publication number: CN111357221B
Application number: CN201880074653.0A
Authority: CN
Inventors: 李剑; 许昌龙; 陈凯; 武良明; 蒋靖; 徐浩
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2017-11-20
Filing date: 2018-10-02
Publication date: 2023-06-16
Anticipated expiration: 2038-10-02
Also published as: US11184116B2; JP7366895B2; WO2019095362A1; BR112020009560A2; KR20200089263A; SG11202003425UA; JP2021503825A; EP3714563A4; EP3714563A1; WO2019095886A1; US20200351029A1; CN111357221A; EP3714563B1

Abstract

Aspects of the present disclosure relate generally to wireless communications. In some aspects, a wireless communication device may perform a first transmission of a communication encoded using a polar coding technique; and performing at least one retransmission of the communication, wherein more resources are allocated to the at least one retransmission than are allocated to the first transmission, and wherein the at least one retransmission comprises an incremental redundancy version of the communication and a version of the communication for chase combining. Numerous other aspects are provided.

Description

Techniques and apparatus for hybrid automatic repeat request design of polar codes for ultra-reliable low-latency communications

Cross Reference to Related Applications

The present application claims priority from Patent Cooperation Treaty (PCT) patent application No. PCT/CN2017/111835 entitled "TECHNIQUES AND APPARATUSES FOR HYBRID AUTOMATIC REPEAT REQUEST DESIGN OF POLAR CODES FOR ULTRA-RELIABLE LOW LATENCY COMMUNICATIONS" filed on 11/20, 2017, which is expressly incorporated herein by reference.

Technical Field

Aspects of the present disclosure relate generally to wireless communications, and more particularly, to techniques and apparatus for hybrid automatic repeat request (HARQ) design of polar codes for ultra-reliable low latency communications (URLLC).

Background

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, time Division Multiple Access (TDMA) systems, frequency Division Multiple Access (FDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-advanced is an enhanced set of Universal Mobile Telecommunications System (UMTS) mobile standards published by the third generation partnership project (3 GPP).

The wireless communication network may include a plurality of Base Stations (BSs) capable of supporting communication for a plurality of User Equipments (UEs). A User Equipment (UE) may communicate with a Base Station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a node B, gNB, an Access Point (AP), a radio head, a transmission-reception point (TRP), a New Radio (NR) BS, a 5G node B, and the like.

The above multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different user devices to communicate at the urban, national, regional, and even global levels. The new radio technology (NR), which may also be referred to as 5G, is an enhanced set of LTE mobile standards promulgated by the third generation partnership project (3 GPP). NR aims to better support mobile broadband internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the Downlink (DL) (CP-OFDM), using CP-OFDM and/or SC-FDM (e.g., also known as discrete fourier transform spread OFDM (DFT-s-OFDM)) on the Uplink (UL) with other open standards, and supporting beamforming, multiple Input Multiple Output (MIMO) antenna technology and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access techniques and telecommunication standards that use these techniques.

Disclosure of Invention

In some aspects, a wireless communication method performed by a wireless communication device may include performing a first transmission of a communication encoded using a polarization encoding technique; and performing at least one retransmission of the communication, wherein more resources are allocated to the at least one retransmission than are allocated to the first transmission, and wherein the at least one retransmission comprises an incremental redundancy version of the communication and a version of the communication for chase combining.

In some aspects, a wireless communication device may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to perform a first transmission of communications encoded using a polar encoding technique; and performing at least one retransmission of the communication, wherein more resources are allocated to the at least one retransmission than are allocated to the first transmission, and wherein the at least one retransmission comprises an incremental redundancy version of the communication and a version of the communication for chase combining.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by the one or more processors of the wireless communication device, may cause the one or more processors to perform a first transmission of a communication encoded using a polar encoding technique; and performing at least one retransmission of the communication, wherein more resources are allocated to the at least one retransmission than are allocated to the first transmission, and wherein the at least one retransmission comprises an incremental redundancy version of the communication and a version of the communication for chase combining.

In some aspects, an apparatus may include means for performing a first transmission of a communication encoded using a polar coding technique; and means for performing at least one retransmission of the communication, wherein more resources are allocated to the at least one retransmission than to the first transmission, and wherein the at least one retransmission comprises an incremental redundancy version of the communication and a version of the communication for chase combining.

Aspects generally include a method, apparatus, system, computer program product, non-transitory computer readable medium, user device, wireless communication device, and processing system as substantially described herein with reference to and as illustrated in the accompanying drawings and description.

The foregoing has outlined rather broadly the features and technical advantages of examples in accordance with the present disclosure in order that the detailed description that follows may be better understood. Other features and advantages will be described below. The disclosed concepts and specific examples may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, both as to their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in connection with the accompanying drawings. Each of the figures is provided for the purpose of illustration and description, and is not intended as a definition of the limits of the claims.

Drawings

So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to some of its aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.

Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with aspects of the present disclosure.

Fig. 2 is a block diagram conceptually illustrating an example of a base station communicating with a User Equipment (UE) in a wireless communication network, in accordance with aspects of the present disclosure.

Fig. 3 is a diagram illustrating an example of HARQ techniques for polarization encoded URLLC communications in accordance with various aspects of the disclosure.

Fig. 4A-4D are diagrams illustrating examples of transmission and retransmission configurations for HARQ for polarization encoded URLLC communications in accordance with various aspects of the disclosure.

Fig. 5 is a diagram illustrating an exemplary process performed, for example, by a wireless communication device, in accordance with aspects of the present disclosure.

Detailed Description

Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the disclosure. For example, an apparatus may be implemented or a method practiced using any number of the aspects set forth herein. In addition, the scope of the present disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or structure and functionality that is additional or different from the aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims.

Several aspects of the telecommunications system will now be presented with reference to various apparatus and techniques. These devices and techniques will be described in the following detailed description and illustrated in the figures by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

It should be noted that while aspects may be described herein using terms commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure may be applied to other generation-based communication systems, such as 5G and higher, including NR technologies.

Fig. 1 is a diagram illustrating a network 100 in which aspects of the present disclosure may be practiced. The network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. Wireless network 100 may include multiple BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110 d) and other network entities. A BS is an entity that communicates with User Equipment (UE) and may also be referred to as a base station, NR BS, node B, gNB, 5G Node B (NB), access point, transmission-reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to a coverage area of a BS and/or a BS subsystem serving the coverage area, depending on the context in which the term is used.

The BS may provide communication coverage for macro cells, pico cells, femto cells, and/or other types of cells. A macrocell can cover a relatively large geographic area (e.g., a few kilometers in radius) and can allow unrestricted access by UEs with service subscription. The pico cell may cover a smaller geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a smaller geographic area (e.g., a home) and may allow limited access for UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG)). The BS for the macro cell may be referred to as a macro BS. The BS for the pico cell may be referred to as a pico BS. The BS for the femto cell may be referred to as a femto BS or a home BS. In the example shown in fig. 1, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102 c. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "node B", "5G NB" and "cell" are used interchangeably herein.

In some aspects, the cells may not necessarily be stationary, and the geographic area of the cells may move according to the location of the mobile BS. In some aspects, BSs may be interconnected to each other and/or to one or more other BSs or network nodes (not shown) in the access network 100 through various types of backhaul interfaces, such as direct physical connections, virtual networks, and the like, using any suitable transport network.

The wireless network 100 may also include relay stations. A relay station is an entity capable of receiving data transmissions from an upstream station (e.g., a BS or UE) and sending the data transmissions to a downstream station (e.g., a UE or BS). The relay station may also be a UE capable of relaying transmissions for other UEs. In the example shown in fig. 1, relay station 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120 d. The relay station may also be referred to as a relay BS, a relay base station, a relay, etc.

The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BS, pico BS, femto BS, relay BS, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless communication network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, femto BS, and relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

The network controller 130 may be coupled to a set of BSs and provide coordination and control for the BSs. The network controller 130 may communicate with the BS via a backhaul. The BSs may also communicate with each other, for example, directly or indirectly through a wireless or wired backhaul.

UEs 120 (e.g., 120a, 120b, 120 c) may be dispersed throughout wireless network 100, and each UE may be stationary or mobile. A UE may also be called an access terminal, mobile station, subscriber unit, station, etc. The UE may be a cellular telephone (e.g., a smart phone), a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a Wireless Local Loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, a superbook, a medical device or apparatus, a biometric sensor/device, a wearable device (smart watch, smart clothing, smart glasses, smart bracelet, smart jewelry (e.g., smart ring, smart bracelet, etc.), an entertainment device (e.g., music or video device, satellite radio, etc.), a vehicle component or sensor, a smart meter/sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate over a wireless or wired medium.

Some UEs may be considered Machine Type Communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, such as sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. The wireless node may provide a connection for or to a network (e.g., a wide area network such as the internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered internet of things (IoT) devices and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered Customer Premises Equipment (CPE). UE 120 may be included within a housing that houses components of UE 120, such as processor components, memory components, and the like.

In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular RAT and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, etc. The frequency may also be referred to as a carrier wave, frequency channel, etc. Each frequency may support a single RAT in a given geographical area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120 e) may communicate directly with each other using one or more side link channels (e.g., without using BS 110 as an intermediary device). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-all (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, and the like. In this case, UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein, performed by BS 110.

As mentioned above, fig. 1 is provided by way of example only. Other examples are possible and may differ from the example described with respect to fig. 1.

Fig. 2 shows a block diagram of a design 200 of BS 110 and UE 120, which may be one of the base stations and one of the UEs in fig. 1. BS 110 may be equipped with T antennas 234a through 234T and ue 120 may be equipped with R antennas 252a through 252R, where typically T is ≡1 and R is ≡1.

At BS 110, transmit processor 220 may receive data from data sources 212 of one or more UEs, select one or more Modulation and Coding Schemes (MCSs) for each UE based at least in part on Channel Quality Indicators (CQIs) received from the UEs, process (e.g., encode and modulate) the data for each UE based at least in part on the MCSs selected for the UEs, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-Static Resource Partitioning Information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.) and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRSs)) and synchronization signals (e.g., primary Synchronization Signals (PSS) and Secondary Synchronization Signals (SSS)). A Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T Modulators (MODs) 232a through 232T. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232T may be transmitted through T antennas 234a through 234T, respectively. According to various aspects described in greater detail below, a synchronization signal may be generated using position coding to convey additional information.

At UE 120, antennas 252a through 252r may receive the downlink signals from BS110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254R, perform MIMO detection on the received symbols if applicable, and provide detected symbols. Receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to data reception device 260, and provide decoded control information and system information to controller/processor 280. The channel processor may determine a Reference Signal Received Power (RSRP), a Received Signal Strength Indicator (RSSI), a Reference Signal Received Quality (RSRQ), a Channel Quality Indicator (CQI), etc.

On the uplink, at UE 120, transmit processor 264 may receive and process data from data source 262 and control information from controller/processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to BS 110. At BS110, uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 (if applicable), and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller/processor 240.BS 110 may include a communication unit 244 and communicate with network controller 130 via communication unit 244. The network controller 130 may include a communication unit 294, a controller/processor 290, and a memory 292.

In some aspects, one or more components of UE 120 may be included in a housing. Controller/processor 240 of BS 110, controller/processor 280 of UE 120, and/or any other component of fig. 2 may perform one or more techniques associated with HARQ for the polar code of the URLLC, as described in more detail elsewhere herein. For example, controller/processor 240 of BS 110, controller/processor 280 of UE 120, and/or any other component of fig. 2 may perform or direct operations of process 500 of fig. 5 and/or other processes described herein, for example.

Memories

242 and 282 may store data and program codes for BS 110 and UE 120, respectively. The scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.

In some aspects, a wireless communication device (e.g., BS 110 and/or UE 120) may include means for performing a first transmission of a communication encoded using a polar coding technique; a unit for performing at least one retransmission of the communication, wherein more resources are allocated to the at least one retransmission than to the first transmission, and wherein the at least one retransmission comprises an incremental redundancy version of the communication and a chase combining version of the communication; etc. In some aspects, such units may include one or more components of BS 110 and/or UE 120 described in connection with fig. 2.

As noted above, fig. 2 is provided by way of example only. Other examples are possible and may differ from the example described with respect to fig. 2.

Communications in a wireless network may be associated with delay and/or reliability requirements. In some aspects, the reliability requirements may be achieved using HARQ techniques. For example, when a first transmission of a communication is unsuccessful, a wireless communication device (e.g., BS 110 and/or UE 120) may retransmit the communication until the recipient device successfully decodes the communication. Incremental Redundancy (IR) is one method for HARQ retransmissions, where each retransmission contains different information (e.g., data and/or parity bits) than the previous retransmission or transmission. Chase combining is another approach for HARQ, where each retransmission contains data bits and parity bits. For a polar code with a low code rate, the IR may have a small gain over chase combining.

However, the stringent delay requirements associated with URLLC communications may limit how many retransmissions can be performed. Furthermore, using equal sized resources for the first transmission and retransmission may be inefficient, further increasing the amount of time required to successfully provide URLLC and further increasing the difficulty in meeting the URLLC requirements.

Some techniques and apparatuses described herein perform a first transmission of a communication encoded using a polar coding technique and perform at least one retransmission of the communication (e.g., based at least in part on HARQ techniques). The resources allocated to at least one retransmission may be more than the resources allocated to the first transmission, thereby improving the efficiency of the HARQ technique. Further, the at least one retransmission may include an incremental redundancy version of the communication and a version of the communication for chase combining. This may further increase the likelihood of success of the HARQ technique. In this way, throughput is increased while meeting delay requirements. Furthermore, each retransmission of the at least one retransmission may be self-decodable (e.g., decodable without the first transmission), which increases the resilience of the communication and increases the likelihood of the HARQ technique being successful.

Fig. 3 is a diagram illustrating an example 300 of HARQ techniques for polarization encoded URLLC communications in accordance with various aspects of the disclosure. Fig. 3 shows UE120 in communication with BS 110. In example 300, UE120 is a wireless communication device as described herein that performs a first transmission and at least one retransmission. However, in some aspects, BS 110 or another device may perform the first transmission and at least one retransmission.

As indicated by reference numeral 310, UE 120 may perform a first transmission of a communication. For example, the communication may be a URLLC communication associated with delay requirements and/or reliability requirements. As further shown, the communication may be polarization encoded. In some aspects, the techniques and apparatus described herein may be applied to coding techniques other than polarization coding.

As shown by reference numeral 320, BS 110 may provide a HARQ negative acknowledgement (negative ACK or NACK). The HARQ NACK may indicate that BS 110 did not successfully solveAnd (3) code first transmission. Thus, UE 120 may need to perform one or more communication retransmissions to meet delay requirements and/or reliability requirements. However, performing one or more retransmissions with a resource allocation equal to the resource allocation used for the first transmission may be inefficient as compared to performing the first transmission and at least one retransmission with unequal resource allocation. As an illustrative example, assume that the resources for the first transmission and the single retransmission are equal in size. Further assume that the first transmission is sent using, for example, 2 resources and with a Frame Error Rate (FER) of 0.01, and that the single retransmission is sent using 2 resources and with 1e ^-5 For example, to meet URLLC requirements). In this case, the expected amount of resources required to successfully perform communication may be equal to 2×0.99+ (2+2) 0.01=2.02.

As indicated by reference numeral 330, UE 120 may perform at least one retransmission of the communication based at least in part on receiving the HARQ NACK. As further shown, at least one retransmission may have a larger resource allocation than the first transmission. As another illustrative example, assume that the first transmission is sent using 1 resource and with a FER of 0.1, and that the one or more retransmissions are 3 resources and with a FER of 1e ^-5 Is transmitted by the set FER of (c). In this case, the expected amount of resources required to successfully perform communication may be equal to 1×0.9+ (1+3) 0.1=1.3. Thus, resource efficiency and throughput of URLLC communication are improved.

As further shown, the at least one retransmission may include an IR version of the communication and/or a chase combining version of the communication (e.g., one or more repetitions of the communication for chase combining). Examples of content for at least one retransmission are described in more detail elsewhere herein. By performing retransmissions of the IR version and chase combining version, HARQ performance is improved compared to performing retransmissions of only one of the IR version or chase combining version. Furthermore, self-decoding of at least one retransmission is possible, which further improves HARQ performance.

In some aspects, a wireless communication device (e.g., UE 120) may perform multiple retransmissions. For example, UE 120 may perform the first retransmission and may determine whether the first retransmission was successful based on the HARQ ACK or NACK received from BS 110. If the first retransmission is successful, UE 120 may stop the retransmission. If the first retransmission is unsuccessful, UE 120 may perform the second retransmission and may continue to perform the retransmission until a HARQ ACK is received from BS 110.

As described above, fig. 3 is provided as an example. Other examples are possible and may differ from the example described with respect to fig. 3.

Fig. 4A-4D are diagrams illustrating an example 400 of a transmission and retransmission configuration for HARQ for polarization encoded URLLC communications in accordance with various aspects of the disclosure.

As shown in fig. 4A and by reference numeral 410, a first transmission of communications may be performed in a first resource allocation and may be denoted by the letter a. In fig. 4A-4D, the size of the allocated resources may be represented by the horizontal length of the corresponding box. For example, a box with a larger horizontal length may be associated with a larger resource allocation than a box with a smaller horizontal length. The horizontal length of the boxes in fig. 4A-4D is not necessarily scaled or exactly proportional to the size of the corresponding resource allocation.

As indicated by reference numeral 420, retransmission of the communication may be performed in a second resource allocation that is larger than the first resource allocation. As further shown, the retransmission may include an IR version of the communication. For example, the IR version may be denoted by B. In some aspects, the value of B (e.g., |b|) may be equal to the value of a (e.g., |a|). In some aspects, the value of B (e.g., |b|) may not be equal to the value of a (e.g., |a|). As shown, the retransmission may include one or more versions of the communication for chase combining. For example, the retransmission may include a version of a (e.g., a ') and/or an IR version of a (e.g., B and B ') for chase combining with the communication of the first transmission (e.g., a), and may include a version of B (e.g., B ') for chase combining with the IR version of a (e.g., B). In some aspects, the second transmission may be self-decodable without the first transmission.

As shown in fig. 4B and by reference numeral 430, in some aspects, the retransmission may include multiple repetitions of a. For example, multiple repetitions may be used to chase combining with the first transmission of a and/or with each other. In some aspects, the multiple repetitions may include a complete repetition of a and/or a partial repetition of a. For example, the multiple repetitions may include 2 repetitions, 5 repetitions, 3.5 repetitions, 3.1 repetitions, and the like. In some aspects, the second transmission may be self-decodable without the first transmission.

Fig. 4C and 4D show examples in which multiple retransmissions are performed. As shown in fig. 4C and by reference numeral 440, in some aspects, the first retransmission may include an IR version of a (e.g., B). As indicated by reference numeral 450, in some aspects, the second retransmission may include versions of a and/or B (e.g., a 'and B') for chase combining. The first retransmission may be sent in a different resource or time slot than the second retransmission, which may improve the diversity of the communication and thus the reliability. In some aspects, the first retransmission and/or the second retransmission may be self-decodable without the first transmission and/or without each other. For example, each of the first transmission, the first retransmission, and the second retransmission may be self-decodable.

As shown in fig. 4D and by reference numeral 460, in some aspects the first retransmission may comprise an IR version (e.g., B) of communication a. As shown at reference numeral 470, the second retransmission may include versions of a and B (e.g., a 'and B') for chase combining. As indicated by reference numeral 480, the third retransmission may include other versions of a and B (e.g., a "and B") for chase combining and/or IR. In some aspects, the first retransmission, the second retransmission, and/or the third retransmission may be self-decodable without the first transmission and/or without each other. For example, each of the first transmission, the first retransmission, the second retransmission, and the third retransmission may be self-decodable.

As described with respect to fig. 4A-4D, in some aspects a' may be equal to a (e.g., the same). In some aspects, a' may be a subset of a. In some aspects, a' may be a null value. As an example, a' may be omitted from the second retransmission of fig. 4D. Similarly, B' may be equal to B (e.g., the same). In some aspects, B' may be a subset of B. In some aspects, B' may be a null value. As an example, B' may be omitted from the second retransmission of fig. 4D. In some aspects, a 'and B' may be provided in any order. For example, in some aspects, B 'may precede a'.

As described with respect to fig. 4D, in some aspects, a "may be equal to a (e.g., the same). In some aspects, a "may be a subset of a. In some aspects, a "may be a null value. As an example, a) may be omitted from the third retransmission of fig. 4D. Similarly, B "may be equal to B (e.g., the same). In some aspects, B "may be a subset of B. In some aspects, B "may be a null value. As an example, B) may be omitted from the third retransmission of fig. 4D. In some aspects, a "and B" may be provided in any order. For example, in some aspects, B "may precede a".

As described above, fig. 4A-4D are provided as examples. Other examples are possible and may differ from the examples described with respect to fig. 4A-4D.

Fig. 5 is a diagram illustrating an exemplary process 500 performed, for example, by a wireless communication device, in accordance with aspects of the present disclosure. The exemplary process 500 is an example in which a wireless communication device (e.g., BS 110, UE 120, etc.) performs HARQ techniques for polarization encoded URLLC communications.

As shown in fig. 5, in some aspects, process 500 may include performing a first transmission of a communication encoded using a polar coding technique (block 510). For example, the wireless communication device may perform a first transmission. The first transmission may be a transmission of a communication encoded using a polar encoding technique. In some aspects, the communication may be a URLLC communication.

As shown in fig. 5, in some aspects, the process 500 may include performing at least one retransmission of the communication, wherein more resources are allocated to the at least one retransmission than are allocated to the first transmission, and wherein the at least one retransmission includes an incremental redundancy version of the communication and a version of the communication for chase combining (block 520). For example, the wireless communication device may perform at least one retransmission of the communication. The resources allocated to at least one retransmission may be more than the resources allocated to the first transmission, thereby improving the efficiency of HARQ for the communication. The at least one transmission may include an IR version of the communication and/or a version of the communication for chase combining.

Process 500 may include other aspects, such as any single aspect or any combination of aspects described below.

In some aspects, at least one retransmission is decodable without the first transmission. In some aspects, the value of the first transmission of the communication is different than the value of the incremental redundancy version of the communication. In some aspects, the version of the communication used to chase the combining is a repetition of the first transmission of the communication. In some aspects, the version of the communication used to chase the merge is a subset of the first transmission of the communication. In some aspects, the version of the communication used to catch up with the merge is a repetition or subset of the incremental redundancy version of the communication.

In some aspects, the at least one retransmission includes multiple versions of the communication for chase combining. In some aspects, the incremental redundancy version of the communication is transmitted in a first retransmission of the at least one retransmission and the version of the communication for chase combining is transmitted in a second retransmission of the at least one retransmission. In some aspects, versions of the communication for chase combining are transmitted in a plurality of second retransmissions of the at least one retransmission.

In some aspects, the first transmission of the communication and the at least one retransmission of the communication are for hybrid automatic repeat request (HARQ) operations. In some aspects, the communication is an ultra-reliable low latency communication, and the first transmission and the at least one retransmission are used to implement a latency threshold associated with the ultra-reliable low latency communication.

While fig. 5 shows example blocks of process 500, in some aspects process 500 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than shown in fig. 5. Additionally or alternatively, two or more blocks of process 500 may be performed in parallel.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit aspects to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the aspects.

As used herein, the term component is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, or a combination of hardware and software.

Some aspects are described herein in connection with threshold values. As used herein, satisfying a threshold may refer to a value greater than a threshold, greater than or equal to a threshold, less than or equal to a threshold, not equal to a threshold, etc.

It is apparent that the systems and/or methods described herein may be implemented in different forms of hardware, firmware, or combinations of hardware and software. The actual specialized control hardware or software code used to implement the systems and/or methods is not limiting of these aspects. Thus, the operations and behavior of the systems and/or methods were described without reference to the specific software code-it being understood that software and hardware can be designed to implement the systems and/or methods based at least in part on the description herein.

Although specific combinations of features are expressed in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of possible aspects. Indeed, many of these features may be combined in ways not specifically set forth in the claims and/or disclosed in the specification. Although each of the dependent claims listed below may depend directly on only one claim, disclosure of possible aspects includes each dependent claim in combination with each other claim in the claim set. The phrase referring to "at least one of" a list of items refers to any combination of these items, including individual members. As an example, "at least one of a, b, or c" is intended to cover: a. b, c, a-b, a-c, b-c, and a-b-c, and any combination with multiples of the same element (e.g., a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b-b, b-b-c, c-c, and c-c-c, or any other ordering of a, b, and c).

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Furthermore, as used herein, the articles "a" and "an" are intended to include one or more items, and may be used interchangeably with "one or more". Furthermore, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, a combination of related and unrelated items, etc.), and are used interchangeably with "one or more. Where only one item is intended, the terms "a" or "an" or similar language are used. Furthermore, as used herein, the terms "having," "with," and the like are intended to be open ended terms. Furthermore, unless explicitly stated otherwise, the phrase "based on" is intended to mean "based, at least in part, on".

Claims

1. A wireless communication method performed by a wireless communication device, comprising:

performing a first transmission of a communication encoded using a polarization encoding technique; and

at least one retransmission of the communication is performed,

wherein more resources are allocated to the at least one retransmission than to the first transmission,

wherein the at least one retransmission includes an incremental redundancy version of the communication, a version of the communication for chase combining and a version of the incremental redundancy version of the communication for chase combining,

wherein the incremental redundancy version of the communication is transmitted in a first one of the at least one retransmission, wherein the version of the communication for chase combining and the version of the incremental redundancy version of the communication for chase combining are transmitted in a second one of the at least one retransmission, and

wherein the resources used for the first retransmission are different from the resources used for the second retransmission.

2. The method of claim 1, wherein the at least one retransmission is decodable without the first transmission.

3. The method of claim 1, wherein a value of the first transmission of the communication is different from a value of the incremental redundancy version of the communication.

4. The method of claim 1, wherein the version of the communication used to chase combining is a repetition of the first transmission of the communication.

5. The method of claim 1, wherein the version of the communication for chase combining is a subset of the first transmission of the communication.

6. The method of claim 1, wherein the version of the incremental redundancy version of the communication that is used to chase combining is a repetition or subset of the incremental redundancy version of the communication.

7. The method of claim 1, wherein the at least one retransmission comprises multiple versions of the communication for chase combining.

8. The method of claim 1, wherein the at least one retransmission further comprises a second version of the communication for chase combining and a second version of the incremental redundancy version of the communication for chase combining, and

wherein the second version of the communication for chase combining and the second version of the incremental redundancy version of the communication for chase combining are transmitted in a third retransmission of the at least one retransmission.

9. The method of claim 1, wherein the first transmission of the communication and the at least one retransmission of the communication are for a hybrid automatic repeat request (HARQ) operation.

10. The method of claim 1, wherein the communication is an ultra-reliable low-latency communication, and wherein the first transmission and the at least one retransmission are to implement a latency threshold associated with the ultra-reliable low-latency communication.

11. A wireless communication device, comprising:

a memory; and

one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:

at least one retransmission of the communication is performed, wherein more resources are allocated to the at least one retransmission than to resources of the first transmission, wherein the at least one retransmission comprises an incremental redundancy version of the communication, a version of the communication for chase combining and a version of the incremental redundancy version of the communication for chase combining, wherein the incremental redundancy version of the communication is sent in a first retransmission of the at least one retransmission, wherein the version of the communication for chase combining and the version of the incremental redundancy version of the communication for chase combining are sent in a second retransmission of the at least one retransmission, and wherein resources for the first retransmission are different from resources for the second retransmission.

12. The wireless communication device of claim 11, wherein the at least one retransmission is decodable without the first transmission.

13. The wireless communication device of claim 11, wherein a value of the first transmission of the communication is different from a value of the incremental redundancy version of the communication.

14. The wireless communication device of claim 11, wherein the version of the communication for chase combining is a repetition of the first transmission of the communication.

15. The wireless communication device of claim 11, wherein the version of the communication for chase combining is a subset of the first transmission of the communication.

16. The wireless communication device of claim 11, wherein the version of the incremental redundancy version of the communication that is used to chase combining is a repetition or subset of the incremental redundancy version of the communication.

17. The wireless communication device of claim 11, wherein the at least one retransmission comprises multiple versions of the communication for chase combining.

18. The wireless communication device of claim 11, wherein the at least one retransmission further comprises a second version of the communication for chase combining and a second version of the incremental redundancy version of the communication for chase combining, and

19. The wireless communication device of claim 11, wherein the first transmission of the communication and the at least one retransmission of the communication are for hybrid automatic repeat request (HARQ) operations.

20. The wireless communication device of claim 11, wherein the communication is an ultra-reliable low-latency communication, and wherein the first transmission and the at least one retransmission are to implement a latency threshold associated with the ultra-reliable low-latency communication.

21. A non-transitory computer-readable medium storing instructions for wireless communication, which when executed by one or more processors of a wireless communication device, cause the one or more processors to:

22. The non-transitory computer-readable medium of claim 21, wherein the at least one retransmission is decodable without the first transmission.

23. The non-transitory computer-readable medium of claim 21, wherein a value of the first transmission of the communication is different from a value of the incremental redundancy version of the communication.

24. The non-transitory computer-readable medium of claim 21, wherein the version of the communication for chase combining is a repetition of the first transmission of the communication.

25. The non-transitory computer-readable medium of claim 21, wherein the version of the communication for chase combining is a subset of the first transmission of the communication.

26. The non-transitory computer-readable medium of claim 21, wherein the version of the incremental redundancy version of the communication that is used to chase combining is a repetition or subset of the incremental redundancy version of the communication.

27. The non-transitory computer-readable medium of claim 21, wherein the at least one retransmission comprises multiple versions of the communication for chase combining.

28. The non-transitory computer-readable medium of claim 21, wherein the at least one retransmission further comprises a second version of the communication for chase combining and a second version of the incremental redundancy version of the communication for chase combining, and

29. The non-transitory computer-readable medium of claim 21, wherein the first transmission of the communication and the at least one retransmission of the communication are for hybrid automatic repeat request (HARQ) operations.

30. The non-transitory computer-readable medium of claim 21, wherein the communication is an ultra-reliable low-latency communication, and wherein the first transmission and the at least one retransmission are to implement a latency threshold associated with the ultra-reliable low-latency communication.

31. An apparatus for wireless communication, comprising:

means for performing a first transmission of a communication encoded using a polarization encoding technique; and

Means for performing at least one retransmission of the communication,

wherein more resources are allocated to the at least one retransmission than to the first transmission, wherein the at least one retransmission comprises an incremental redundancy version of the communication, a version of the communication for chase combining and a version of the incremental redundancy version of the communication for chase combining, wherein the incremental redundancy version of the communication is sent in a first retransmission of the at least one retransmission, wherein the version of the communication for chase combining and the version of the incremental redundancy version of the communication for chase combining are sent in a second retransmission of the at least one retransmission, and wherein resources for the first retransmission are different from resources for the second retransmission.

32. The apparatus of claim 31, wherein the at least one retransmission is decodable without the first transmission.

33. The apparatus of claim 31, wherein a value of the first transmission of the communication is different from a value of the incremental redundancy version of the communication.

34. The apparatus of claim 31, wherein the version of the communication used to chase combining is a repetition of the first transmission of the communication.

35. The apparatus of claim 31, wherein the version of the communication for chase combining is a subset of the first transmission of the communication.

36. The apparatus of claim 31, wherein the version of the incremental redundancy version of the communication that is used to chase combining is a repetition or subset of the incremental redundancy version of the communication.

37. The apparatus of claim 31, wherein the at least one retransmission comprises multiple versions of the communication for chase combining.

38. The apparatus of claim 31, wherein the at least one retransmission further comprises a second version of the communication for chase combining and a second version of the incremental redundancy version of the communication for chase combining, and

39. The apparatus of claim 31, wherein the first transmission of the communication and the at least one retransmission of the communication are for hybrid automatic repeat request (HARQ) operations.

40. The apparatus of claim 31, wherein the communication is an ultra-reliable low-latency communication, and wherein the first transmission and the at least one retransmission are to implement a latency threshold associated with the ultra-reliable low-latency communication.